#include<stdio.h>
#include<math.h>
int main()
{
    //lekai
  int i,j,n=0,x;
  for(i=23;n==0;i+=2)
  {
    for(j=1,x=i;j<=4&&x>=11;j++)
    if((x+1)%(j+1)==0)
    x-=(x+1)/(j+1);
    else{x=0;break;}
    if(j==5&&x==11)
    {printf("There are %d fishes at first.\n",i);
       n=1;
    }
  }  
}